BNC seminar on               Magnetic Ordering in Ba3RRu2O9 (R = Tb, Tm)                            by          Deepak Garg (GNeuS fellow, JCNS, Garching, Germany)                             in                    Building 26 Lecture hall, KFKI Campus                            on            27 March, 2025     14:00 - 14:45 + discussion   Meeting link

Abstract:

The Ru-based compounds are always interesting to study due to the spatially extended 4d-orbitals and substantial spin-orbit coupling leading to a variety of interesting physical properties, like quantum spin liquid and orbital ordering [1,2]. The study becomes further interesting by combining Ru with rare earths (R) owing to the interactions between 4d and 4f electrons leading to a complex magnetic order. Among the various 4f-4d systems, the Ba₃RRu₂O₉ (R = rare earth) family of compounds have gained special interest owing to their diverse magnetic ground states ranging from ferromagnetic to antiferromagnetic depending upon the R atom [3,4].

In this talk, I will discuss magnetic ordering in polycrystalline Ba₃RRu₂O₉ (R = Tb and Tm) compounds using microscopic techniques of neutron diffraction and muon spin relaxation (MuSR), including their crystal structures, magnetometry results, and potential applications. 

References
[1] A. Banerjee, C. A. Bridges, J.-Q. Yan, A. A. Aczel, L. Li, M. B. Stone, G. E. Granroth, M. D. Lumsden, Y. Yiu, J. Knolle, S. Bhattacharjee, D. L. Kovrizhin, R. Moessner, D. A. Tennant, D. G. Mandrus and S. E. Nagler, Nat. Mater. 15, 733, (2016).
[2] P. Khalifah, R. Osborn, Q. Huang, H. W. Zandbergen, R. Jin, Y. Liu,7 D. Mandrus, R. J. Cava, Science 297, 2237 (2002).
[3] Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield, Phys. Rev. B 87, 134402 (2013).
[4]. Y. Doi, and Y. Hinatsua, J. Mater. Chem., 12,1792, 2002.